\begin{table}[tbhp] \centering {\begin{tabular}{l*{5}{c}}
\hline
                    &\multicolumn{1}{c}{2002}&\multicolumn{1}{c}{2003}&\multicolumn{1}{c}{2004}&\multicolumn{1}{c}{2005}&\multicolumn{1}{c}{2006}\\
\hline
a11 last month hours worked&       156.5&       160.3&       162.4&       159.2&       174.5\\
                    &     (68.33)&     (62.72)&     (64.27)&     (73.56)&     (79.69)\\
 \hline
\hline
\end{tabular} } \end{table} 
